html,
body {
    width: 100%;
    height: 100%;
    padding: 0;
    margin: 0 auto;
    /* 一般body不设置，要设置在对应元素的父级上 */
    position: relative;
    /* 防止页面溢出视口 */
    overflow: hidden;
}

.background {
    width: 100%;
    height: 100%;
    /* width和max-width属于同类型属性，都可以影响元素宽度，后写的会覆盖先写的 */
    /* max-width: 3840px; */
    background: #487eb0;
    top: 0;
    position: absolute;
    z-index: -1;
}

.header {
    width: 100%;
    /* min-width: 1920px; */
    height: 75px;

    padding: 0;
    position: absolute;
    /* top定位属性，一定要在元素自身是absolute、fixed、relative或者sticky */
    top: 0px;


}

#top-layer {
    position: absolute;
    width: 100%;
    height: 100%;
    margin: 0;
    top: 0;
    left: 0px;
    z-index: 1;
    /* display: none; */
}

#top-layer>img {
    width: 100%;
    height: 100%;
}

#top-title {
    /* left: 1600px;
    position: relative;
    top: 5px;
    z-index: 2; */
    width: 320px;
    height: 60px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;

    /* margin: 0; */
    /* position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%); */
    /* z-index: 2; */


}

#top-title>img {
    width: 100%;
}

.header_right {
    /* width: 100px;
    height: 50px;
    background-color: red; */
    display: flex;
    align-items: center;
    color: #C1E8FD;
    font-size: 12px;
    position: absolute;
    top: 17%;
    right: 31px;

    z-index: 2;

}

.header_right_shezhiicon {
    width: 14px;
    height: 14px;
}

.header_right_shezhi {
    margin-left: 10px;
}

.header_right_touxiang {
    width: 32px;
    height: 32px;
    margin-left: 20px;
}

#settingicon {
    width: 14.41px;
    height: 14.41px;
    display: flex;
    justify-content: center;
    align-items: center;
}

#settingicon>img {
    width: 100%;
}

.setting {
    font-size: 12px;
    margin-left: 10px;
}

#usericon {
    width: 32px;
    height: 32px;
    margin-left: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
}

#usericon>img {
    width: 100%;
}

/* #usericon {

    position: relative;
    top: 13px;
    right: 31px;
    z-index: 3;
    float: right;
} */

/* #settingicon {
    position: absolute;
    top: 53px;
    right: 200px;
    float: right;
    width: 14.41px;
    height: 14.41px;
    z-index: 3;

} */

/* .setting {
    position: absolute;
    top: 70px;
    right: 118px;
    width: 50px;
    height: 32px;
    float: right;
    font-size: 20px;
    font-family: Microsoft YaHei-Regular;
    font-weight: 400;
    color: #C1E8FD;
    line-height: 0px;
    z-index: 4;
} */

#datetime {
    color: #C1E8FD;
    position: absolute;
    top: 10px;
    left: 40px;
    font-size: 14px;
    z-index: 3;
}

.rightbar {
    display: flex;
    flex-direction: column;
    right: 40px;
    top: 181px;
    gap: 60px;
    /* float: right; */
    position: absolute;

}

.rightbar img {
    width: 72px;
    height: 68px;
}

.leftbar {
    display: flex;
    flex-direction: column;
    position: relative;
    width: 320px;
    height: 620px;
    top: 141px;
    left: 25px;
    background: rgba(0, 13, 24, 0.6);
    border-radius: 0px 0px 0px 0px;
    /* opacity: 0.6; */
    /* 内边距注意不要影响整个盒子宽高 */
    padding-top: 12px;
    padding-left: 26px;
    box-sizing: border-box;
}

#leftborder1 {
    width: 30px;
    height: 4px;
    top: -16px;
    position: absolute;
    background: #05AFE6;
    border-radius: 0px 0px 0px 0px;
    opacity: 1;
}

#leftborder2 {
    width: 18px;
    height: 4px;
    background: #02739B;
    border-radius: 0px 0px 0px 0px;
    opacity: 1;
    top: -16px;
    left: 20px;
    position: absolute;
    background: #05AFE6;
}

.lefticon1 {
    width: 46px;
    height: 44px;
    left: 70px;
    top: -1135px;
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 122px;
    z-index: 4;
}

.lefticon2 {
    width: 46px;
    height: 44px;
    left: 70px;
    top: -520px;
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 270px;
    z-index: 4;
}

h1 {
    width: 250px;
    height: 52px;
    top: -1235px;
    left: 140px;
    position: relative;
    letter-spacing: 8px;
    text-align: left;
    font-family: Microsoft YaHei-Bold;
    font-weight: bold;
    font-size: 40px;

}

h2 {
    width: 250px;
    height: 52px;
    top: -1215px;
    left: 235px;
    text-align: left;
    position: relative;
    letter-spacing: 8px;
    font-family: Microsoft YaHei-Regular;
    font-weight: 400;
    font-size: 40px;
    color: #00d5ff;
}

h3 {
    width: 350px;
    height: 52px;
    top: -1145px;
    left: 235px;
    text-align: left;
    position: relative;
    letter-spacing: 8px;
    font-family: Microsoft YaHei-Regular;
    font-weight: 400;
    font-size: 40px;
    color: #FFFFFF;
}

h4 {
    width: 350px;
    height: 52px;
    top: -705px;
    left: -110px;
    text-align: left;
    position: relative;
    letter-spacing: 8px;
    font-family: Microsoft YaHei-Regular;
    font-weight: 400;
    font-size: 40px;
    color: #FFFFFF;
}

.menu1 {
    display: flex;
    flex-direction: column;
    gap: 40px;
    float: left;
    position: relative;
}

a:link {
    color: #FFFFFF;
    text-decoration: none;
}

a:visited {
    color: #FFFFFF;
    text-decoration: none;
}

.bottom {
    position: absolute;
    width: 100%;
    bottom: 0px;
    padding: 0;
    /* left: 13%; */
    margin: 0;
}

/* 空格和>的区别？ */
.bottom>img {
    width: 100%;
    height: 100%;
}

/* 建议布局结构样式表 */
.catalogue {
    width: 100%;
    color: red;
    font-size: 20px;
    margin-top: 20px;
}